Ancient Arctic ice could tell us about the future of permafrost

(PhysOrg.com) -- Researchers have discovered the oldest known ice in North America, and that permafrost may be a significant touchstone when looking at global warming.

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<p><a href="http://www.physorg.com/news141317582.html">Ancient Arctic ice could tell us about the future of permafrost</a></p> <p>(PhysOrg.com) -- Researchers have discovered the oldest known ice in North America, and that permafrost may be a significant touchstone when looking at global warming. </p>